fix(marketplace): correct stale hook references and migration guide errors

- claude-config-audit-settings.md: update hook inventory to post-Decision #29 state
- maintainer.md: remove PostToolUse references, update to current hook types
- settings-optimization.md: update review layer table and hooks.json format
- claude-config-optimize-settings.md: fix stale doc-guardian PostToolUse reference
- project-hygiene/claude-md-integration.md: rewrite for manual /hygiene check
- doc-guardian: update doc-sync.md and sync-workflow.md hook references
- MIGRATION-v9.md: mark deleted commands as Removed, not renamed
- projman/task-sizing.md: PostToolUse → PreToolUse in example
- scripts/setup.sh: /labels-sync → /labels sync
- docs/CONFIGURATION.md: doc-guardian "Commands and hooks" → "Commands only"
- docs/prompts/INDEX.md: add prompt execution index

Version: 9.0.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/project-hygiene/claude-md-integration.md

@@ -1,14 +1,23 @@
 ## Project Cleanup (project-hygiene)
 
-This project uses the **project-hygiene** plugin for automated post-task cleanup.
+This project uses the **project-hygiene** plugin for file organization and cleanup checks.
 
 ### How It Works
 
-The plugin automatically runs after file Write or Edit operations to:
+Run `/hygiene check` to scan for common project cleanliness issues:
 
-1. **Delete temporary files** - Removes `*.tmp`, `*.bak`, `__pycache__/`, `.pytest_cache/`, etc.
-2. **Warn about unexpected root files** - Alerts when files are created outside expected locations
-3. **Identify orphaned files** - Detects supporting files that may no longer be needed
+1. **Temp file detection** — finds `*.tmp`, `*.bak`, `*.swp`, `*~` files
+2. **Misplaced files** — files outside their expected directories
+3. **Empty directories** — directories with no files
+4. **Large files** — files exceeding reasonable size thresholds
+5. **Debug artifacts** — leftover debug logs, console.log, print statements
+
+### Usage
+
+```
+/hygiene check              # Run all checks
+/hygiene check --fix        # Auto-fix safe issues (delete temp files, remove empty dirs)
+```
 
 ### Configuration
 
@@ -23,14 +32,7 @@ The plugin can be configured via `.hygiene.json` in the project root:
 }
 ```
 
-### Hook Events
+### Notes
 
-The plugin registers on the following events:
-- `PostToolUse` (matcher: `Write|Edit`) - Runs cleanup after file modifications
-
-### Usage Guidelines
-
-- Let the hook run automatically - no manual intervention needed
-- Review warnings about unexpected root files
-- Configure `.hygiene.json` to customize cleanup behavior for your project
-- Check cleanup output if files seem to disappear unexpectedly
+- This was previously a PostToolUse hook (automatic). Since v8.1.0 (Decision #29), it runs manually via `/hygiene check`.
+- Add `/hygiene check` as an explicit step in your prompt files where project cleanliness matters.